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Discontinued operations - Financial information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Discontinued operations |  |
Revenue | $ 0 | $ 3,127,767
Income from operations | 0 | 1,154,897
Net Income |  | 1,115,825
Gain on sale of discontinued operations | 3,621,170 | 0
Depreciation | $ 0 | $ 115,363

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